REISERFS (device loop4): journal params: device loop4, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop4): checking transaction log (loop4)
REISERFS (device loop4): Using r5 hash to sort names
==================================================================
BUG: KASAN: out-of-bounds in leaf_paste_entries+0x69c/0xae4 fs/reiserfs/lbalance.c:1377
Read of size 18446744073709551600 at addr ffff0000f8304fa4 by task syz.4.217/5758

CPU: 1 PID: 5758 Comm: syz.4.217 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0xfc mm/kasan/report.c:524
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x258/0x290 mm/kasan/generic.c:189
 memmove+0x48/0x90 mm/kasan/shadow.c:54
 leaf_paste_entries+0x69c/0xae4 fs/reiserfs/lbalance.c:1377
 balance_leaf_finish_node_paste_dirent fs/reiserfs/do_balan.c:1295 [inline]
 balance_leaf_finish_node_paste fs/reiserfs/do_balan.c:1321 [inline]
 balance_leaf_finish_node fs/reiserfs/do_balan.c:1364 [inline]
 balance_leaf+0x8318/0xd92c fs/reiserfs/do_balan.c:1452
 do_balance+0x270/0x790 fs/reiserfs/do_balan.c:1888
 reiserfs_paste_into_item+0x5d0/0x6e0 fs/reiserfs/stree.c:2159
 reiserfs_add_entry+0x86c/0xc28 fs/reiserfs/namei.c:567
 reiserfs_mkdir+0x5bc/0x7bc fs/reiserfs/namei.c:862
 xattr_mkdir fs/reiserfs/xattr.c:76 [inline]
 create_privroot fs/reiserfs/xattr.c:882 [inline]
 reiserfs_xattr_init+0x2b0/0x6b4 fs/reiserfs/xattr.c:1005
 reiserfs_fill_super+0x1944/0x1d40 fs/reiserfs/super.c:2175
 mount_bdev+0x264/0x358 fs/super.c:1443
 get_super_block+0x44/0x58 fs/reiserfs/super.c:2601
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632
 vfs_get_tree+0x90/0x274 fs/super.c:1573
 do_new_mount+0x228/0x810 fs/namespace.c:3078
 path_mount+0x5bc/0xe80 fs/namespace.c:3408
 do_mount fs/namespace.c:3421 [inline]
 __do_sys_mount fs/namespace.c:3629 [inline]
 __se_sys_mount fs/namespace.c:3606 [inline]
 __arm64_sys_mount+0x49c/0x59c fs/namespace.c:3606
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the physical page:
page:000000007ab26895 refcount:2 mapcount:0 mapping:00000000837ce908 index:0x213 pfn:0x138304
memcg:ffff0000d11e8000
aops:def_blk_aops ino:700004
flags: 0x5ffd60000002052(referenced|lru|workingset|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffd60000002052 fffffc0004093448 ffff0000d11ea208 ffff0000c049f610
raw: 0000000000000213 ffff0000f6755e80 00000002ffffffff ffff0000d11e8000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000f8304e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000f8304f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000f8304f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                               ^
 ffff0000f8305000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000f8305080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
REISERFS (device loop4): Created .reiserfs_priv - reserved for xattr storage.